dc.contributor.author | Uysal, İbrahim | |
dc.contributor.author | Akmaz, Recep Melih | |
dc.contributor.author | Kapsiotis, Argyrios | |
dc.contributor.author | Demir, Yılmaz | |
dc.contributor.author | Saka, Samet | |
dc.contributor.author | Avcı, Erdi | |
dc.contributor.author | Mueller, Dirk | |
dc.date.accessioned | 2020-12-19T19:57:46Z | |
dc.date.available | 2020-12-19T19:57:46Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Uysal, I., Akmaz, R.M., Kapsiotis, A., Demir, Y., Saka, S., Avci, E., Mueller, D. (2015). Genesis and geodynamic significance of chromitites from the Orhaneli and Harmancik ophiolites (Bursa, NW Turkey) as evidenced by mineralogical and compositional data. Ore Geology Reviews, 65, 26-41. https://doi.org/10.1016/j.oregeorev.2014.08.006 | en_US |
dc.identifier.issn | 0169-1368 | |
dc.identifier.issn | 1872-7360 | |
dc.identifier.uri | https://doi.org/10.1016/j.oregeorev.2014.08.006 | |
dc.identifier.uri | https://hdl.handle.net/11436/2884 | |
dc.description | Uysal, Ibrahim/0000-0001-7607-2893; AVCI, Erdi/0000-0002-3659-992X; | en_US |
dc.description | WOS: 000348084400002 | en_US |
dc.description.abstract | Chromitites from Orhaneli and Harmancik ophiolites (Bursa, NW Turkey) are mainly associated with dunites. They occur as banded and lenticular bodies showing massive and disseminated textures and are composed of magnesiochromite grains characterized by the following composition: Cr2O3 = 58.30-61.19 wt.%, Al2O3 = 8.32-10.03 wt.% and TiO2 = 0.14-0.21 wt.%. the Cr# [Cr/(Cr + Al)] values of magnesiochromite from both ophiolites range between 0.80 and 0.83 and their Mg# [Mg/(Mg + Fe2+)] values vary from 0.52 to 0.69. However, one chromitite sample (BO13B) from the Orhaneli ophiolite contains magnesiochromite with relatively low Cr2O3 (4838 wt.%), high Al2O3 (15.16 wt.%) and TiO2 (030 wt%) contents, and average Cr# and Mg# values of 0.68 and 056, respectively. Although the total content of platinum-group elements (PGE) in most chromitite samples varies between 83 and 169 ppb, two samples from the Orhaneli ophiolite show enrichments in total PGE (up to 500 ppb). Several platinum-group mineral (PGM) grains occur as minute inclusions in magnesiochromite grains (1-15 mu m across). Laurite is dominant PGM phase, followed by erlichmanite, unidentified Ru-Ni-Fe sulfide, irarsite, hollingworthite, native osmium and iridium. Millerite and pentlandite represent the most abundant primary base-metal mineral inclusions in magnesiochromite, whereas bornite, awaruite, heazlewoodite, violarite and orcelite are mostly observed in the secondary silicate groundmass. Olivine, clinopyroxene and amphibole are also identified as silicate inclusions in the magnesiochromite. the composition of the magnesiochromite and the parental melts in equilibrium indicate that these magnesiochromite grains were most likely crystallized from boninitic melts in an arc setting. However, BO13B chromitite sample from the Orhaneli chromitites may have crystallized from arc-related melt of probably an island arc tholeiite affinity. (C) 2014 Elsevier B.V. All rights reserved. | en_US |
dc.description.sponsorship | scientific projects - Karadeniz Technical UniversityKaradeniz Technical University [BAP 804]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [109Y219] | en_US |
dc.description.sponsorship | This study was supported by scientific projects funded by Karadeniz Technical University (BAP 804) and TUBITAK (109Y219). Fernando Gervilla and Jose Maria Gonzalez-Jimenez are greatly acknowledged for their help with the SEM images and preliminary investigations of platinum-group and base-metal minerals. We thank Federica Zaccarini and Giorgio Garuti for the electron microprobe analyses and element mapping of platinum-group minerals. Karl Thomas Fehr, Rupert Hochleitner and Melanie Kaliwoda are thanked for their generous help with the electron microprobe analyses. Comments from Benxun Su and an anonymous reviewer as well as Editor Franco Pirajno helped improve this paper. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | info:eu-repo/semantics/closedAccess | en_US |
dc.subject | Platinum-group mineral | en_US |
dc.subject | Platinum-group element | en_US |
dc.subject | Chromitite | en_US |
dc.subject | Ophiolite | en_US |
dc.subject | Turkey | en_US |
dc.title | Genesis and geodynamic significance of chromitites from the Orhaneli and Harmancik ophiolites (Bursa, NW Turkey) as evidenced by mineralogical and compositional data | en_US |
dc.type | article | en_US |
dc.contributor.department | RTEÜ, Mühendislik ve Mimarlık Fakültesi, Jeoloji Mühendisliği Bölümü | en_US |
dc.contributor.institutionauthor | Demir, Yılmaz | |
dc.identifier.doi | 10.1016/j.oregeorev.2014.08.006 | |
dc.identifier.volume | 65 | en_US |
dc.identifier.startpage | 26 | en_US |
dc.identifier.endpage | 41 | en_US |
dc.relation.journal | Ore Geology Reviews | en_US |
dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | en_US |